EP3485978B1 - Structure de montage de rotor et séparateur centrifuge - Google Patents

Structure de montage de rotor et séparateur centrifuge Download PDF

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Publication number
EP3485978B1
EP3485978B1 EP16908814.3A EP16908814A EP3485978B1 EP 3485978 B1 EP3485978 B1 EP 3485978B1 EP 16908814 A EP16908814 A EP 16908814A EP 3485978 B1 EP3485978 B1 EP 3485978B1
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EP
European Patent Office
Prior art keywords
rotor
shaft
piece
inclined surface
hole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16908814.3A
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German (de)
English (en)
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EP3485978A4 (fr
EP3485978A1 (fr
Inventor
Satoshi TOMARU
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kubota Manufacturing Corp
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Kubota Manufacturing Corp
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Publication date
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Publication of EP3485978A4 publication Critical patent/EP3485978A4/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B9/00—Drives specially designed for centrifuges; Arrangement or disposition of transmission gearing; Suspending or balancing rotary bowls
    • B04B9/08—Arrangement or disposition of transmission gearing ; Couplings; Brakes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B7/00—Elements of centrifuges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B7/00—Elements of centrifuges
    • B04B7/02—Casings; Lids
    • B04B7/06—Safety devices ; Regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B9/00—Drives specially designed for centrifuges; Arrangement or disposition of transmission gearing; Suspending or balancing rotary bowls
    • B04B9/12—Suspending rotary bowls ; Bearings; Packings for bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B9/00—Drives specially designed for centrifuges; Arrangement or disposition of transmission gearing; Suspending or balancing rotary bowls
    • B04B9/08—Arrangement or disposition of transmission gearing ; Couplings; Brakes
    • B04B2009/085—Locking means between drive shaft and rotor

Definitions

  • the present invention relates to a centrifuge and, in particular, relates to a rotor attachment structure.
  • Fig. 1 shows an internal structure of a centrifuge described in Patent Literature 1 and, in Fig. 1, 1 denotes a rotary shaft whose shaft center coincides with a vertical direction and 2 denotes a rotary head attached to the upper part of the rotary shaft. Moreover, 3 denotes a rotor which is disposed in the upper part of the rotary head 2 and 4 denotes a lid that covers the upper part of the rotor 3.
  • the rotor 3 includes a plurality of sample insertion portions 5 and also includes, for example, rotor holes 6 and 7 into which the rotary head 2 is inserted, a frame 8, male members 9-1 and 9-2, and a guide pin 10.
  • the rotor hole 6 is a circular hole with a fixed diameter
  • the rotor hole 7 is formed as a circular hole whose diameter decreases toward the inside of the hole.
  • the male members 9-1 and 9-2 are rotatable about rotating shafts 11-1 and 11-2 horizontally disposed in the rotor hole 6, the centers of gravity are located below the rotating shafts 11-1 and 11-2, and the male members 9-1 and 9-2 have projections 13-1 and 13-2 on the sides opposite to a shaft center 12 of the rotary shaft 1 below the centers of gravity.
  • the male members 9-1 and 9-2 are attached to the frame 8, and the frame 8 is attached to the rotor 3.
  • the rotor 3 has through holes 14 and 15, and the through hole 15 formed in the frame 8 is screw-threaded.
  • the rotary head 2 includes, in the upper part thereof, a rotor coupling portion 16 and drive pins 17.
  • the rotor coupling portion 16 has the shape of a cylinder whose center coincides with the shaft center 12 of the rotary shaft 1, and has a ring-shaped depression 18 in the inner side face thereof.
  • the rotary head 2 includes a circular cylinder portion 19 that is fitted into the rotor hole 6 and a truncated cone portion 20 that is fitted into the rotor hole 7.
  • the lid 4 has a knob 21 and a screw portion 22 for threaded engagement with the through hole 15 of the frame 8.
  • the guide pin 10 can move only between the drive pins 17, and, when the rotary head 2 rotates, power is transferred to the guide pin 10 from the drive pins 17 and the rotor 3 rotates.
  • the rotor 3 stops with the rotary head 2.
  • the male members 9-1 and 9-2 move by the centrifugal force in such a way that the projections 13-1 and 13-2 are fitted into the depression 18 and, if a force that separates the rotor 3 from the rotary head 2 (a force that causes the rotor 3 to rise) is applied when the projections 13-1 and 13-2 are fitted into the depression 18, in this example, a force is applied to the projections 13-1 and 13-2 in a direction in which the projections 13-1 and 13-2 are fitted into the depression 18.
  • a force that separates the rotor 3 from the rotary head 2 is applied during rotation, the projections 13-1 and 13-2 and the depression 18 are not separated from each other, which makes it possible to achieve reliable fixation.
  • Patent Literature 1 Japanese Registered Patent No. 5442337
  • the male members 9-1 and 9-2 are rotatably disposed in the rotor 3 and, as a result of the male members 9-1 and 9-2 moving (rotating) by the centrifugal force which is generated at the time of rotation of the rotor 3 and the projections 13-1 and 13-2 of the male members 9-1 and 9-2 being fitted into the depression 18 of the rotary head 2, the rotor 3 is fixed to the rotary head 2.
  • An object of the present invention is to provide a rotor attachment structure that allows a rotor to be reliably fixed by simply being put and assembly on the rotor's side to be easily performed.
  • a tip side of the shaft is a rotor coupling portion in a shape of a cylinder
  • a ring-shaped depression is formed in an inner periphery of the rotor coupling portion and a ring-shaped projection is formed on a side closer to a tip than the ring-shaped depression
  • a corner of the ring-shaped projection on an inner periphery thereof on a side where the ring-shaped depression is located is chamfered and a first shaft inclined surface is formed
  • a face from the first shaft inclined surface to a bottom face of the ring-shaped depression is a second shaft inclined surface which forms an acute angle with the bottom face
  • the rotor has a rotor hole into which the shaft is inserted and an attachment fitting is disposed in the rotor hole.
  • the attachment fitting comprises: a main body that is housed in the rotor coupling portion; first and second pieces that are disposed in a piece placement hole formed in the main body so as to pass therethrough in a direction orthogonal to a rotation central axis of the rotor; a leaf spring that includes a base, two long and short extension portions formed by being bent from both ends of the base in the same direction, and two arm portions formed so as to extend from the tips of the extension portions in a shape of a circular arc so as to surround the rotation central axis, the leaf spring with the extension portions and the arm portions which are inserted into the piece placement hole via an opening formed in the main body above the piece placement hole so as to communicate with the piece placement hole; and a retainer that is mounted on the main body and puts the base between the retainer and the main body.
  • the first piece has a first groove into which the arm portion formed in the long extension portion is inserted and includes, with the first groove placed therebetween, a first side wall portion located on one end side of the piece placement hole and a first central part located on the rotation central axis.
  • the second piece has a second groove into which the arm portion formed in the short extension portion is inserted and includes, with the second groove placed therebetween, a second side wall portion located on another end side of the piece placement hole and a second central part located on the first central part.
  • Each of outer side faces of the first side wall portion and the second side wall portion has a shape of a circular arc, and, in each of the outer side faces, a first inclined surface and a second inclined surface corresponding to a shape formed by the first shaft inclined surface and the second shaft inclined surface are formed respectivly.
  • the first and second pieces are positioned by the arm portions and located in the piece placement hole.
  • the first and second pieces move by centrifugal force so as to protrude from one end and another end of the piece placement hole, respectively, against a spring force of the leaf spring and the first inclined surfaces make contact with the first shaft inclined surface.
  • Rise of the rotor from the shaft is prevented as a result of the second inclined surfaces making contact with the second shaft inclined surface.
  • the first and second pieces move horizontally by the centrifugal force which is generated by the rotation of the rotor and make contact with the rotor coupling portion of the shaft, which causes the rotor and the shaft to be fastened together and makes it possible to prevent rise of the rotor, and it is possible to attach the rotor to the shaft by simply putting the rotor onto the shaft.
  • Fig. 2 shows the internal structure of a centrifuge provided with an embodiment of a rotor attachment structure according to the present invention and, in Fig. 2 , 30 denotes a shaft attached to a drive shaft (not shown in the drawing) of a motor and 40 denotes a rotor attached to the shaft 30. Moreover, 50 denotes an attachment fitting attached to the rotor 40.
  • Fig. 3 is an exploded view of individual components of the structure shown in Fig. 2
  • the attachment fitting 50 includes, as shown in Fig. 3 , a main body 60, a first piece 70, a second piece 80, a leaf spring 90, and a retainer 100.
  • Figs. 4A and 4B show the attachment fitting 50 constituted as a result of the first and second pieces 70 and 80, the leaf spring 90, and the retainer 100 being incorporated into the main body 60.
  • the shaft 30 is made up of a large-diameter portion 31, a small-diameter portion 32, and a taper portion 33 that connects these large-diameter portion 31 and small-diameter portion 32, and the tip side of the small-diameter portion 32 is a rotor coupling portion 34 in the shape of a cylinder.
  • a ring-shaped depression 35 is formed, and, on the side closer to the tip than the ring-shaped depression 35, a ring-shaped projection 36 projecting from a bottom face 35a of the ring-shaped depression 35 is formed.
  • a corner of the ring-shaped projection 36 on the inner periphery thereof on the side where the ring-shaped depression 35 is located is chamfered, and a first shaft inclined surface 36a is formed.
  • a face from the first shaft inclined surface 36a to the bottom face 35a of the ring-shaped depression 35 is a second shaft inclined surface 36b which forms an acute angle with the bottom face 35a.
  • drive pins 37 are provided so as to project therefrom.
  • three drive pins 37 are provided at equiangular intervals on the circumference of a circle, and the tip of each drive pin 37 has a tapered shape.
  • a circular hole 38 that is used to bolt the shaft 30 to the drive shaft of the motor is formed.
  • the main body 60 of the attachment fitting 50 has a shape shown in Figs. 6A to 6F and is broadly made up of a circular cylinder portion 61, a flange portion 62 located on the upper-end side of the circular cylinder portion 61, and a drive pin contact portion 63 located on the lower-end side of the circular cylinder portion 61.
  • a piece placement hole 64 which is large in size, is formed so as to pass therethrough in a direction orthogonal to the shaft center thereof.
  • the piece placement hole 64 is formed in the shape of a rectangular hole.
  • an opening 65 that communicates with the piece placement hole 64 and opens on the upper side after passing through the circular cylinder portion 61 and the flange portion 62 is formed.
  • the opening 65 is formed in the shape of a rectangle with chamfered corners.
  • a depression 66 is formed as an arc-shaped notch.
  • the arc-shaped contours of the two depressions 66 are located on the circumference of one circle, and the opening 65 is formed so as to cross the circumference of this circle.
  • grooves 67 are formed in the shape of a cross. The grooves 67 are formed from a pair of short side portions of the opening 65 and the two depressions 66 to the outer periphery of the flange portion 62. The depth of the grooves 67 is made smaller than the depth of the depressions 66.
  • four threaded holes 68a are formed, and, in the position of the shaft center of the circular cylinder portion 61, a circular hole 68b is formed so as to pass therethrough below the piece placement hole 64.
  • the drive pin contact portion 63 is made up of six rectangular columns 69 radially disposed at equiangular intervals about the hole 68b.
  • Each rectangular column 69 is formed so as to protrude from the lower face of the circular cylinder portion 61, and the tip thereof has a sharp-pointed shape.
  • the first piece 70 has a shape shown in Figs. 7A to 7F and has a central part 71 and a side wall portion 72 located on one side of the central part 71, and a groove 73 is provided between the central part 71 and the side wall portion 72.
  • the central part 71 and the side wall portion 72 are coupled together by a coupling portion 74 located below the groove 73.
  • a side face 71a of the central part 71 on the side thereof where the groove 73 is located has a dogleg shape, and, as a result of the width of the central part 71, which is located on the side opposite to the side face 71a having a dogleg shape, being reduced so as to be smaller than the width of the side face 71a, a bottom face 70a of the piece 70 has a substantially convex shape.
  • a circular hole 75 is formed so as to pass vertically therethrough, and a portion of the hole 75 at the upper-end circumferential edge thereof located on the side opposite to the groove 73 is cut and an inclined surface 76 is formed.
  • the side wall portion 72 is higher than the central part 71 and an outer side face 72a of the side wall portion 72 has the shape of a circular arc.
  • a second inclined surface 72b and a first inclined surface 72c which have the shapes of circular arcs concentric with the shape of a circular arc of the outer side face 72a, are formed, and an upper end of the side wall portion 72 leading to the first inclined surface 72c is a horizontal surface 72d.
  • the shape formed by the first inclined surface 72c and the second inclined surface 72b is a shape corresponding to the shape formed by the first shaft inclined surface 36a and the second shaft inclined surface 36b of the shaft 30; that is, the inclination angles of the first inclined surface 72c and the second inclined surface 72b are made equal to the inclination angles of the first shaft inclined surface 36a and the second shaft inclined surface 36b.
  • the position of the center of gravity of the piece 70 having the above-described shape is located in a position closer to the side wall portion 72 than the central axis of the hole 75.
  • the second piece 80 has a shape shown in Figs. 8A to 8F and has a central part 81 and a side wall portion 82 located on one side of the central part 81, and a groove 83 is provided between the central part 81 and the side wall portion 82.
  • An outer side face 82a of the side wall portion 82 has the shape of a circular arc, and a bottom face 80a of the piece 80 has the shape of the letter U in which the side wall portion 82 forms an intermediate part of the letter U.
  • Outer wall portions 84 and 85 form leg portions of the letter U, and the central part 81 is located on these outer wall portions 84 and 85 and is separated from the bottom face 80a by being supported by the outer wall portions 84 and 85 and a coupling portion 86 located below the groove 83. Since the piece 80 has such a bottom face 80a in the shape of the letter U, the piece 80 can stand alone.
  • a side face 81a of the central part 81 on the side thereof where the groove 83 is located and a side face 81b of the central part 81 on the opposite side have the shape of a dogleg.
  • a circular hole 87 is formed so as to pass vertically therethrough, and a portion of the hole 87 at the upper-end circumferential edge thereof located on the side opposite to the groove 83 is cut and an inclined surface 88 is formed.
  • a second inclined surface 82b and a first inclined surface 82c which have the shapes of circular arcs concentric with the shape of a circular arc of the outer side face 82a, are formed, and an upper end of the side wall portion 82 leading to the first inclined surface 82c is a horizontal surface 82d.
  • the shapes of these horizontal surface 82d, first inclined surface 82c, and second inclined surface 82b are the same as the shapes of the horizontal surface 72d, the first inclined surface 72c, and the second inclined surface 72b of the side wall portion 72 of the piece 70.
  • the height position of the horizontal surface 82d is made equal to the height position of the upper face of the central part 81.
  • the position of the center of gravity of the piece 80 is located in a position closer to the side wall portion 82 than the central axis of the hole 87.
  • the leaf spring 90 has a shape shown in Figs. 9A to 9D and is made up of a base 91 having a substantially elliptical shape, two long and short extension portions 92 and 93 which are formed by being bent 90 degrees from both ends of the base 91 in the same direction, and two arm portions 94 and 95 formed so as to extend from the tips of the extension portions 92 and 93 in the direction of the width of the extension portions 92 and 93. In the center of the base 91, a circular hole 96 is formed.
  • the two arm portions 94 and 95 are formed in the shape of a circular arc so as to surround the central axis of the hole 96, the two arm portions 94 and 95 are made to have the same width and length, and the distances L1 and L2 from the central axis of the hole 96 shown in Fig. 9A are also made equal to each other.
  • the retainer 100 has a shape shown in Figs. 10A to 10C and is made up of a circular cylinder portion 101 and four protrusions 102 protruding from the periphery of the circular cylinder portion 101 on the upper-end side thereof so as to form the shape of a cross. In the center of the circular cylinder portion 101, a threaded hole 103 is formed.
  • Fig. 11 shows assembly of the individual components that constitute the attachment fitting 50, and the piece 70 and the piece 80 are disposed by being inserted into the piece placement hole 64 of the main body 60.
  • the leaf spring 90 the extension portions 92 and 93 and the arm portions 94 and 95 are inserted into the piece placement hole 64 via the opening 65, and the base 91 is fitted into the depressions 66 of the main body 60.
  • the retainer 100 is mounted on the main body 60.
  • the circular cylinder portion 101 of the retainer 100 is fitted into the depressions 66 and the protrusions 102 in the shape of a cross are fitted into the groove 67 of the main body 60.
  • the pieces 70 and 80, the leaf spring 90, and the retainer 100 are incorporated into the main body 60 in this way, which completes the attachment fitting 50.
  • Figs. 12A to 12D show the relationship between the piece 70 and the piece 80 incorporated into the main body 60, the central part 81 of the piece 80 is located on the central part 71 of the piece 70 and overlaps therewith, and the side wall portion 72 of the piece 70 and the side wall portion 82 of the piece 80 are located on the sides opposite to each other with a portion, in which the central parts 71 and 81 overlap one another, being placed therebetween. Moreover, a projection portion (part of the central part 71) of the bottom face 70a with a substantially convex shape of the piece 70 enters a letter U of the U-shaped bottom face 80a of the piece 80. As shown in Fig. 12A , the piece 70 and the piece 80 are made equal in height.
  • Fig. 13 shows how the leaf spring 90 is incorporated, the arm portion 94 formed in the long extension portion 92 of the leaf spring 90 is inserted into the groove 73 of the piece 70, and the arm portion 95 formed in the short extension portion 93 is inserted into the groove 83 of the piece 80.
  • Figs. 14A and 14B show the relationship between the pieces 70 and 80 and the leaf spring 90, showing part of the base 91 of the leaf spring 90 in a cutaway view.
  • the arm portions 94 and 95 are in contact with the side face 71a of the central part 71 of the piece 70 and the side face 81a of the central part 81 of the piece 80, respectively, and the piece 70 and the piece 80 are positioned by the arm portions 94 and 95, respectively, that is, held by the arm portions 94 and 95 in predetermined positions in the piece placement hole 64 of the main body 60.
  • the attachment fitting 50 is attached to the rotor 40.
  • the rotor 40 has, as shown in Figs. 2 and 3 , a rotor hole 41 into which the shaft 30 is inserted, and the attachment fitting 50 is attached inside this rotor hole 41. Attachment is performed by using four bolts 110 (see Fig. 3 ), and, as a result of the four bolts 110 being screwed into the threaded holes 68a formed in the main body 60 of the attachment fitting 50 through holes 42 formed in a bottom face 41a of the rotor hole 41, the attachment fitting 50 is screw-held to the bottom face 41a of the rotor hole 41.
  • the base 91 of the leaf spring 90 and the retainer 100 are fixed by being put between the bottom face 41a of the rotor hole 41 and the main body 60.
  • the holes 96, 75, 87, and 68b which are formed in the base 91 of the leaf spring 90, the central part 71 of the piece 70, the central part 81 of the piece 80, and the main body 60, respectively, are located on a rotation central axis 43 of the rotor 40 and the threaded hole 103 of the retainer 100 is also located on the rotation central axis 43.
  • a circular hole 44 is formed so as to be located on the rotation central axis 43.
  • the rotor 40 provided with the attachment fitting 50 is attached to the shaft 30 as shown in Fig. 2 .
  • the rotor 40 is an angle rotor and includes a plurality of container holes 45 which house and hold containers containing samples.
  • the rotor hole 41 has a shape corresponding with the small-diameter portion 32 and the taper portion 33 of the shaft 30, and an opening side (a lower-end side) thereof is formed of a taper face 41b which gradually increases in diameter toward an opening.
  • the taper portion 33 of the shaft 30 is a holding surface that holds the rotor 40, and, as a result of the taper face 41b being placed on the taper portion 33, the rotor 40 is attached to the shaft 30.
  • Figs. 15A to 15E show a state in which, in attachment of the rotor 40 to the shaft 30, the attachment fitting 50 attached to the rotor 40 is inserted into and housed in the rotor coupling portion 34 of the shaft 30, and, since the six rectangular columns 69 formed in the lower part of the main body 60 of the attachment fitting 50 each have a sharp-pointed shape and the three drive pins 37 provided in the rotor coupling portion 34 so as to project therefrom each have a tapered shape, even when the rectangular columns 69 and the drive pins 37 come into contact with each other as shown in Fig. 15B , the rectangular columns 69 are guided into spaces between the drive pins 37 as shown in Fig. 15C .
  • the three drive pins 37 are disposed in alternate spaces between the adjacent rectangular columns 69 as shown in Figs. 15D and 15E , and bodies of the drive pins 37 and the rectangular columns 69 are in contact with each other.
  • the rectangular columns 69 receive power from the drive pins 37, which makes it possible to rotate the rotor 40.
  • the pieces 70 and 80 are located in the piece placement hole 64 of the main body 60, and, as shown in Fig. 16A , the pieces 70 and 80 and the ring-shaped projection 36 of the shaft 30 are separated from each other.
  • the pieces 70 and 80 move in opposite directions in the piece placement hole 64 by the centrifugal force against the spring force of the leaf spring 90, and the pieces 70 and 80 protrude from one end and the other end of the piece placement hole 64 as shown in Fig. 16B .
  • the first inclined surfaces 72c and 82c of the pieces 70 and 80 make contact with the first shaft inclined surface 36a of the ring-shaped projection 36 of the shaft 30.
  • FIGs. 14C and 14D show the relationship between the pieces 70 and 80 and the leaf spring 90 in the above situation, and the arm portions 94 and 95 of the leaf spring 90 are widely opened.
  • Figs. 17A and 17B show two modes, on the side of the piece 70, of a contact state between the pieces 70 and 80 and the ring-shaped projection 36 of the shaft 30;
  • Fig. 17A shows a state in which the first inclined surface 72c of the piece 70 is in contact with the first shaft inclined surface 36a by being pressed against the first shaft inclined surface 36a and
  • Fig. 17B shows a state in which the first inclined surface 72c and the second inclined surface 72b of the piece 70 are in contact with the first shaft inclined surface 36a and the second shaft inclined surface 36b, respectively.
  • Fig. 17B shows a case in which a force that causes the rotor 40 to rise, the force exceeding the fastening power of the rotor 40 and the shaft 30 generated by the contact state of Fig.
  • the pieces 70 and 80 have the first inclined surfaces 72c and 82c with the same shape and the second inclined surfaces 72b and 82b with the same shape, which constitute a contact portion, the contact pressures between the first inclined surfaces 72c and 82c and the first shaft inclined surface 36a are equal to each other and the contact pressures between the second inclined surfaces 72b and 82b and the second shaft inclined surface 36b are equal to each other.
  • Figs. 18A and 18B show forces which are generated in the state shown in Fig. 17A , and a force F1, a force F3, and a force F2 are balanced, the force F1 which the piece 70 receives due to the centrifugal force, the force F3 which the piece 70 receives from the first shaft inclined surface 36a in the direction of the normal to the first shaft inclined surface 36a, and the force F2 which the piece 70 receives from the surface forming the piece placement hole 64 of the main body 60 in the direction of the normal to the surface.
  • the shaft 30 and the rotor 40 are fastened together.
  • An angle ⁇ 1 which the first inclined surface 72c of the piece 70 forms with the vertical direction only has to be 20 degrees or more but 70 degrees or less; preferably, the angle ⁇ 1 is 30 degrees or more but 60 degrees or less and, more preferably, 40 degrees or more but 50 degrees or less. The same goes for the angle of the first inclined surface 82c of the piece 80.
  • Figs. 19A and 19B show forces which are generated in the state shown in Fig. 17B , and a force F4, a force F5, a force F6, and a force F7 are balanced, the force F4 which the piece 70 receives due to the centrifugal force, the force F5 which the piece 70 receives from the surface forming the piece placement hole 64 of the main body 60 in the direction of the normal to the surface, the force F6 which the piece 70 receives from the second shaft inclined surface 36b in the direction of the normal to the second shaft inclined surface 36b, and the force F7 which the piece 70 receives from the first shaft inclined surface 36a in the direction of the normal to the first shaft inclined surface 36a.
  • the rotor 40 does not rise.
  • An angle ⁇ 2 which the second inclined surface 72b of the piece 70 forms with the vertical direction only has to be 90 degrees or less.
  • a locked state in which the pieces 70 and 80 remain in contact with the second shaft inclined surface 36b as shown in Fig. 17B , for example.
  • Such a locked state can be caused, for example, as a result of the pieces 70 and 80 sticking to the shaft 30 with the leaked sample or the like or by a breakage or the like of the leaf spring 90.
  • FIGs. 20A to 20D show how to release the locked state, and a tool 120 is used to return the pieces 70 and 80 to the initial positions in the piece placement hole 64.
  • the tool 120 is made up of a grasping portion 121 and a shaft portion 122; in this example, a screw 122a is formed in the shaft portion 122.
  • the tip of the shaft portion 122 has a tapered shape.
  • Figs. 21A and 21B show release which is performed when the taper face 41b of the rotor hole 41 and the taper portion 33 of the shaft 30, which forms the holding surface that holds the rotor 40, stick to each other, for example.
  • the tip of the shaft portion 122 comes into contact with a bolt 130 that holds the shaft 30 to the drive shaft of the motor, and, by further turning the tool 120 and pressing the shaft portion 122 against the bolt 130, it is possible to cause the rotor 40 to rise as shown in Fig. 21A , which makes it possible to release sticking.
  • the pieces 70 and 80 have the first inclined surfaces 72c and 82c and the second inclined surfaces 72b and 82b formed in the side wall portions 72 and 82, respectively, on the upper-end sides thereof; however, the positions in which the first inclined surfaces 72c and 82c and the second inclined surfaces 72b and 82b are formed are not limited thereto and may be changed.
  • Figs. 24A and 24B and Figs. 25A and 25B show the shapes of pieces 70' and 80' obtained by changing the positions in which the first inclined surfaces 72c and 82c and the second inclined surfaces 72b and 82b are formed
  • Figs. 26A and 26B show the relationship between the pieces 70' and 80' and the rotor coupling portion 34 when the rotation is stopped and at the time of rotation in a manner similar to that of Figs. 16A and 16B described earlier.
  • Portions in Figs. 24A and 24B corresponding to those of Figs. 7A to 7F and portions in Fig. 25A and 25B corresponding to those of Figs. 8A to 8F are identified with the same reference characters.
  • the pieces 70' and 80' have the first inclined surfaces 72c and 82c and the second inclined surfaces 72b and 82b in positions lower than the upper ends of the side wall portions 72 and 82, not on the upper-end sides of the side wall portions 72 and 82; as a result, in a shaft 30', as shown in Figs. 26A and 26B , compared to the shaft 30 shown in Figs. 5A to 5C , the length of the ring-shaped projection 36 in the direction of the rotation central axis 43 is made larger and the positions of the first shaft inclined surface 36a and the second shaft inclined surface 36b are made lower.
  • G1 denotes the position of the center of gravity of the piece 70' and G2 denotes the position of the center of gravity of the piece 80'.
  • These centers of gravity G1 and G2 have the same height h in the direction of the rotation central axis 43, and the height position in the direction of the rotation central axis 43 in which the first inclined surfaces 72c and 82c of the pieces 70' and 80' and the first shaft inclined surface 36a of the shaft 30' make contact with each other at the time of rotation is made to coincide with the height position of the centers of gravity G1 and G2 in this example as shown in Fig. 26B .
  • the height position in which the first inclined surfaces 70c and 80c and the first shaft inclined surface 36a make contact with each other may be brought closer to the height position of the centers of gravity G1 and G2 of the pieces so as to be within an acceptable design range.

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  • Centrifugal Separators (AREA)

Claims (6)

  1. Structure de fixation de rotor à un arbre dans une centrifugeuse, dans laquelle :
    un côté de pointe de l'arbre (30) est une partie de couplage de rotor (34) dans une forme de cylindre,
    une dépression de forme annulaire (35) est formée dans une périphérie interne de la partie de couplage de rotor (34) et une saillie de forme annulaire (36) est formée sur un côté plus à proximité d'une pointe que la dépression de forme annulaire (35),
    un coin de la saillie de forme annulaire (36) sur sa périphérie interne sur un côté où la dépression de forme annulaire (35) est positionnée, est chanfreiné et une première surface inclinée d'arbre (36a) est formée, et une face allant de la première surface inclinée d'arbre (36a) à une face inférieure (35a) de la dépression de forme annulaire (35) est une seconde surface inclinée d'arbre (36b) qui forme un angle aigu avec la face inférieure (35a), et
    le rotor (40) a un trou de rotor (41) dans lequel l'arbre (30) est inséré et un raccord de fixation (50) est disposé dans le trou de rotor (41) ;
    dans laquelle le raccord de fixation (50) comprend :
    un corps principal (60) qui est logé dans la partie de couplage de rotor (34) ;
    des première et seconde pièces (70, 80) qui sont disposées dans un trou de mise en place de pièce (64) formé dans le corps principal (60) afin de passer à travers, dans une direction orthogonale à un axe central de rotation (43) du rotor (40) ; caractérisée par :
    un ressort à lames (90) qui comprend une base (91), deux parties d'extension longue et courte (92, 93) formées en étant pliées à partir des deux extrémités de la base (91) dans une même direction, et deux parties de bras (94, 95) formées afin de s'étendre à partir des pointes des parties d'extension (92, 93) dans une forme d'un arc circulaire afin d'entourer l'axe central de rotation (43), le ressort à lames (90) avec les parties d'extension (92, 93) et les parties de bras (94, 95) qui sont insérées dans le trou de mise en place de pièce (64) via une ouverture (65) formée dans le corps principal (60) au-dessus du trou de mise en place de pièce (64) afin de communiquer avec le trou de mise en place de pièce (64) ; et
    un dispositif de retenue (100) qui est monté sur le corps principal (60) et place la base (91) entre le dispositif de retenue (100) et le corps principal (60) ;
    dans laquelle la première pièce (70) a une première rainure (73) dans laquelle la partie de bras (94) formée dans la partie d'extension longue (92) est insérée et comprend, avec la première rainure (73) placée entre elles, une première partie de paroi latérale (72) positionnée sur un côté d'extrémité du trou de mise en place de pièce (64) et une première partie centrale (71) positionnée sur l'axe central de rotation (43),
    la seconde pièce (80) a une seconde rainure (83) dans laquelle la partie de bras (95) formée dans la partie d'extension courte (93) est insérée et comprend, avec la seconde rainure (83) placée entre elles, une seconde partie de paroi latérale (82) positionnée sur un autre côté d'extrémité du trou de mise en place de pièce (64) et une seconde partie centrale (81) positionnée sur la première partie centrale (71),
    chacune des faces latérales externes (72a, 82a) de la première partie de paroi latérale (72) et de la seconde partie de paroi latérale (82) a une forme d'un arc circulaire et dans chacune des faces latérales externes (72a, 82a), une première surface inclinée (72c, 82c) et une seconde surface inclinée (72b, 82b) correspondant à une forme formée par la première surface inclinée d'arbre (36a) et la seconde surface inclinée d'arbre (36b) sont respectivement formées,
    dans un état dans lequel le rotor (40) est arrêté, les première et seconde pièces (70, 80) sont positionnées par les parties de bras (94, 95) et positionnées dans le trou de mise en place de pièce (64),
    lorsque le rotor (40) est entraîné en rotation par la rotation de l'arbre (30), les première et seconde pièces (70, 80) se déplacent grâce à la force centrifuge afin de faire saillie d'une première extrémité et d'une autre extrémité du trou de mise en place de pièce (64), respectivement, contre une force de rappel du ressort à lames (90) et les premières surfaces inclinées (72c, 82c) établissent le contact avec la première surface inclinée d'arbre (36a), et
    la montée du rotor (40) à partir de l'arbre (30) est empêchée étant donné que les secondes surfaces inclinées (72b, 82b) établissent le contact avec la seconde surface inclinée d'arbre (36b).
  2. Structure de fixation de rotor selon la revendication 1, dans laquelle :
    dans une direction de l'axe central de rotation, une position de hauteur dans laquelle les premières surfaces inclinées et la première surface inclinée d'arbre établissent le contact entre elles et une position de hauteur des centres de gravité des première et seconde pièces coïncident entre elles.
  3. Structure de fixation de rotor selon la revendication 1 ou 2, dans laquelle :
    une face inférieure de la seconde pièce a la forme de la lettre U dans laquelle la seconde partie de paroi latérale forme une partie intermédiaire de la lettre U, et
    la première partie centrale est formée de sorte que l'une de ses parties est positionnée dans la lettre U.
  4. Structure de fixation de rotor selon l'une quelconque des revendications 1 à 3, dans laquelle :
    des trous dont les centres coïncident avec l'axe central de rotation sont formés dans une face inférieure du trou de rotor, la base, les première et seconde parties centrales et le corps principal au-dessous du trou de mise en place afin de passer à travers, et un trou fileté qui coïncide avec des positions des trous est formé dans le dispositif de retenue afin de passer à travers, et
    une partie du trou de la première partie centrale au niveau de son bord circonférentiel d'extrémité supérieure positionné sur un côté opposé à la première rainure et une partie du trou dans la seconde partie centrale au niveau de son bord circonférentiel d'extrémité supérieure positionné sur un côté opposé à la seconde rainure sont coupées et des surfaces inclinées sont formées.
  5. Structure de fixation de rotor selon la revendication 4, dans laquelle :
    le dispositif de retenue est composé d'une partie cylindrique circulaire dans laquelle le trou fileté est formé et des saillies faisant saillie à partir d'une périphérie sur un côté d'extrémité supérieure de la partie cylindrique circulaire afin de former la forme d'une croix, et
    dans le corps principal, des dépressions dans lesquelles la partie cylindrique circulaire est montée, et une rainure dans laquelle les saillies sont montées, sont formées.
  6. Centrifugeuse qui est prévue avec la structure de fixation de rotor selon l'une quelconque des revendications 1 à 5.
EP16908814.3A 2016-07-13 2016-07-13 Structure de montage de rotor et séparateur centrifuge Active EP3485978B1 (fr)

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DE102014112501B4 (de) * 2014-08-29 2017-07-27 Andreas Hettich Gmbh & Co. Kg Zentrifuge
JP6376040B2 (ja) * 2015-05-27 2018-08-22 株式会社デンソー 接合体、及び、その接合体を用いるアクセル装置
JP7089884B2 (ja) 2018-01-25 2022-06-23 株式会社久保田製作所 遠心分離機
JP2021186808A (ja) * 2020-05-29 2021-12-13 ファイバーライト・セントリフュージ・エルエルシー 遠心分離機ロータのバランシングを行うためのシステムおよび方法

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US20190299221A1 (en) 2019-10-03
CN109475880A (zh) 2019-03-15
JP6192860B1 (ja) 2017-09-06
EP3485978A4 (fr) 2020-01-01
JPWO2018011910A1 (ja) 2018-07-19
CN109475880B (zh) 2020-11-27
EP3485978A1 (fr) 2019-05-22
WO2018011910A1 (fr) 2018-01-18
US10532366B2 (en) 2020-01-14

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